In this document we discuss Einstein's Special Theory of Relativity.This is as opposed the his General Theory of Relativity of 1916; this theory considers observers in any state of uniform motion including relative acceleration.The document is based on a discussion of the the theory for an upper-year liberal arts course in Physics without mathematics; in the context of that course the material here takes about 4 or 5 one-hour classes.The treatment is non-mathematical, except for a brief use of Pythagoras' theorem about right triangles.The word special here means that we restrict ourselves to observers in uniform relative motion.Einstein published this theory in 1905.We concentrate on the implications of the theory.It turns out that the general theory is also a theory of gravitation.